diff --git a/build.gradle b/build.gradle
index 3078c65c..5610d16a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-  ext.kotlin_version = "1.2.+"
+  ext.kotlin_version = "[1.2,)"
 
   dependencies {
     repositories { mavenCentral() }
@@ -8,13 +8,13 @@ buildscript {
 }
 
 group = "software.amazon.ion"
-version = "alpha-0.5-SNAPSHOT"
+version = "0.5.0"
 
 repositories { mavenCentral() }
 
 apply plugin: "kotlin"
 dependencies {
-  compile "software.amazon.ion:ion-java:1.2.+"
+  compile "software.amazon.ion:ion-java:[1.2,)"
   compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
   testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
 }